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Electrical Engineering Interview Questions

In the Load Test of 3 Phase Squirrel Cage Induction Motor, 2 wattmeters are used. One of the wattmeter deflects in negative diretion during no load. Why?

CAT,

7529

How to design the blower for motor? how to two blowers connected in motor?

2775

what is Diversity factor in electrical installations

12148

how to decide the ratings of the MCCB,MCB in electrification.give me the proper thumb rule or procedure.

ABB,

2321

how to decide the ratings of the busbar in electrification.give me the proper thumb rule or procedure

ABB,

3318

why excitor coil of an alternator can fail

3588

66kv under ground cable how to layaing in ground any special case two ckt r runing

1011

From an electrical motor & electrical generator, which has more efficiency & why?

Sahi,

1485

why we change the direction of winding in rotor ?how we make the north and south pole?

1142

why we r using alternator instead of d.c generator and induction generator

2311

why alternator is used instead of dc generator and induction generator

2453

what is the full form of KVAR

29714

what is ripple ??? what is harmonics ?

ABB,

10083

how much current in live 11 Kv distribution Line?

ABB,

4205

If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

L&T,

4301

Un-Answered Questions { Electrical Engineering }

if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer

986

static chagre

1150

What are the weight of 800KV DA,DB and DC type tower ?

2244

what is difference between 2 pole structure and 4 pole structure in transformer yard

2881

What is sensitivity of a measurement?

180

for what purpose the star point is done in ct

489

what is the meaning of neutral displacement ???

1763

Why do we apply both Differential and REF (HV and LV) protection schemes on YNyn configuration of a transformer?

1042

If a high resistance fault occurs,then what are the changes will happen in the system?

469

During underground cabling in landscape area what did we cover the cable with to prevent the electric shock & protect the cable?

975

How the over load setting for HT Motors calculated-provided in Numerical Relay

631

Why r u using pf panel. what the uses

971

what is v/f control in VFD?

565

What are merits & De-merits of State-Space Method? What is series programming, parallel programming, general programming & direct programming ? And, difference between these programmings Techniques ?

1481

How shall i select the value of capacitor or inductor in a system?

970